The coupon rate is meaningless. US Treasuries generate a very handsome capital that dwarfs the return on the coupons. Anyone who has been long Treasuries has made a killing. Rates have to do down to reduce demand.
If you buy something that's issued above par with no coupon then you're guaranteed a negative return if you hold it to maturity, unless rates fall further and you can sell it to the 'greater fool'.
GAT
